RADIO ELECTRONIC UNIT Russian patent published in 2001 - IPC

FIELD: radio electronics, design of units carrying out reception and processing of signals of satellite radio navigation systems. SUBSTANCE: technical objective of invention consists in elimination of parasitic and induced noise under conditions of location of heterogeneous functional elements of different degree of integration working with analog and digital signals in frequency range from thousands of MHz to units of Hz on multilayer printed circuit board. One external power supply source is used to supply this unit. Radio electronic unit has printed circuit board with number of conducting layers N≥6 on which electronic elements are grouped in M zones. First zone is zone of functional arrangement of analog radio electronic elements and high-frequency connector intended for connection of antenna. Following zones are zones of functional arrangement of digital radio electronic elements. At least one low-frequency connector meant to connect external devices is arranged in last zone. Ground planes of first zone are located in two internal conducting layers adjacent to external conducting layers. Ground planes of following zones are located in one of internal conducting layers adjacent to one of external conducting layers and are coupled by printing one to another and to ground plane of first zone placed in same layer. Conductors of power supply of first zone are positioned in i-th layer, between second and (N-1) layers. Conductors of power supply of third and next zones coming in the form of planes are located in j-th layer, where j≠i. Supply planes of third and next zones and ground plane of last zone are coupled via contact elements POWER SUPPLY and GROUND to proper leads-out of low- frequency connector. Leads-out of first supply filter are directly connected to contact elements POWER SUPPLY and GROUND. Conductors of power supply of second zone are located in same conducting layer as conductors of power supply of first zone and diverge from common point connected to output lead of second power supply filter that is placed in one of following zones and is coupled with its other leads to plane of power supply and to ground plane of zone of its location. Conductors of power supply of first zone come in the form of printed conductors diverging from common point connected to output lead of third power supply filter placed in second zone and coupled with its other leads to output lead of second filter and ground plane of second zone. Additional screening printed conductors, intercoupled and connected to ground planes of first zone by corresponding holes of interlayers connections arranged in row and spaced by no more than 5.0 mm, are located in external first and N-th conducting layers over perimeter of first zone with breaks in printed conductors crossing this perimeter. Additional printed conductors of screening barrier, intercoupled and coupled to ground plane of third zone with the use of corresponding holes in interlayer connections arranged in row and spaced by no more than 5.0 mm are positioned in both external conducting layers as well as in internal conducting layers of ground planes of second and next zones, along boundary separating third and second zones with breaks in printed conductors crossing this boundary. EFFECT: elimination of parasitic and induced noise when heterogeneous functional elements of different degree of integration are positioned on multilayer printed circuit board. 5 cl, 11 dwg